为了解决接地网支路导体的腐蚀故障诊断问题，采用基于分块模型的接地网故障诊断的算法并基于MATLAB平台，在优化了已有的腐蚀故障诊断软件基础上，设计了接地网分块模型故障诊断的应用软件。 该软件具有8个核心计算模块，具体为：数据输入及参数设置模块、分层拓扑分解模块、结构可测性分析模块、分块模型生成模块、逐层上溯故障诊断模块、状态可测性分析模块、不确定支路范围估计模块和数据输出模块。有机组合这些模块，可以形成2个新的软件子过程，可以满足接地网分块故障诊断的实际需要。 详细说明了在原始接地网基础上自动生成准块、划分块、判断块的类型、判断单元自明性、确定待求本征支路集的程序实现方法；详细说明了从本征接地网逐层追溯计算得到原始接地网待诊断范围中所有支路电阻值或取值范围的各种情形和程序实现方法；详细说明了在分块模型基础上采用状态可测性分析与可测性数值判断法结合的方法进行明晰支路故障诊断的程序实现方法；详细描述了所研制的接地网分块模型故障诊断应用软件子模块采用的输入和输出数据结构以及各个模块的调用方法。 分别以29支路和60支路的接地网为例，对所研制的接地网分块模型故障诊断应用软件进行了测试，并对测试结果进行了分析。分析结果表明，该软件能够正确地将原始接地网自动分解为块、判断出接地网待诊断范围的结构可测性及诊断出待诊断范围内明晰支路的电阻阻值和不确定支路电阻的可能取值范围。实验结果表明所研制软件是正确的且在接地网故障诊断领域具有适用性。

In order to solve the problem of corrosion diagnosis of grounding grids, a software sub-modules of block modeling diagnosis of grounding grids is optimized and designed based on the block model on the platform of Matalab. The developed software consists of eight blocks, such as: the input and configuration module, the topology conversion module, the structural testability evaluation module, the block topology conversion module, the layer traced and fault diagnosis module, the state testability evaluation module, the possible ranges evaluation for uncertain branches module and the data output display module. Combining above modules artificially, two new processes may be formed to meet various requirements of grounding grids block diagnosis. The programming of automatically establishment of quasi-blocks, blocks, determine the block kind, determine the autonomy unit, determine the set of considered intrinsic branches is detailed. The programming of the intrinsic grounding grid to actual grounding grid by layer traced, the clear branch resistances diagnosis, the uncertain branch groups dividing, the possible ranges evaluation for uncertain branches based on dichotomy are described. The programming of combining the state testability analysis and testability value judgments based on block model to solve clear branches fault diagnosis are described. The input and output data structures are given. The relationship of the modules and the way to use the modules are also described. The designed software is tested on the example grounding grids with twenty-nine branches and sixty branches, respectively. The results show that the designed software can work out the models of the blocks of the grounding grids correctly and that it can obtain the resistances of clear branches and the possible ranges evaluation for uncertain branches. The designed software is feasible and a useful tool for grounding grids corrosion diagnosis.